ci: trigger demo only on implementation changes

Updated create-demo.yml workflow to trigger only when source code
changes (src/**, lib/**), not on test changes or demo script updates.

This aligns with standalone demo architecture where each tool maintains
its own demos, and VitePress links to tool READMEs.

Part of Option 1 implementation: demos maintained only in tool repos.

Author: koficodedat

.github/workflows/create-demo.yml

@@ -4,12 +4,11 @@ on:
   # Triggered manually or by meta repo
   workflow_dispatch:
 
-  # Auto-trigger when demo script or tool source changes
+  # Auto-trigger when implementation changes
   push:
     branches:
       - main
     paths:
-      - 'scripts/record-demo.sh'
       - 'src/**'
       - 'lib/**'